Introduce new layouts.Grid construct

calendar.go

@@ -47,8 +47,7 @@ func NewCalendar (tm time.Time) *Calendar {
 	calendar.grid = tomo.NewContainerBox()
 	calendar.grid.SetRole(tomo.R("objects", "CalendarGrid", ""))
 	calendar.grid.SetLayout(layouts.NewGrid (
-		[]bool { true, true, true, true, true, true, true },
-		[]bool { }))
+		true, true, true, true, true, true, true)())
 	calendar.Add(NewInnerContainer (
 		layouts.Row { false, true, false },
 		prevButton, calendar.monthLabel, nextButton))

dialog.go

@@ -66,7 +66,7 @@ func NewDialog (kind DialogKind, parent tomo.Window, title, message string, opti
 	dialog.controlRow.SetAlign(tomo.AlignEnd, tomo.AlignEnd)
 
 	dialog.SetRoot(NewOuterContainer (
-		layouts.NewGrid([]bool { true }, []bool { true, false }),
+		layouts.Column { true, false },
 		NewInnerContainer(layouts.ContractHorizontal, icon, messageText),
 		dialog.controlRow))
 	return dialog, nil

labelcheckbox.go

@@ -24,7 +24,7 @@ func NewLabelCheckbox (value bool, text string) *LabelCheckbox {
 	box.label.SetAlign(tomo.AlignStart, tomo.AlignMiddle)
 	box.Add(box.checkbox)
 	box.Add(box.label)
-	box.SetLayout(layouts.NewGrid([]bool { false, true }, []bool { false }))
+	box.SetLayout(layouts.Row { false, true })
 
 	box.OnMouseUp(box.handleMouseUp)
 	box.label.OnMouseUp(box.handleMouseUp)

labelswatch.go

@@ -25,7 +25,7 @@ func NewLabelSwatch (value color.Color, text string) *LabelSwatch {
 	box.label.SetAlign(tomo.AlignStart, tomo.AlignMiddle)
 	box.Add(box.swatch)
 	box.Add(box.label)
-	box.SetLayout(layouts.NewGrid([]bool { false, true }, []bool { false }))
+	box.SetLayout(layouts.Row { false, true })
 
 	box.OnMouseUp(box.handleMouseUp)
 	box.label.OnMouseUp(box.handleMouseUp)

layouts/grid.go

@@ -18,12 +18,18 @@ type Grid struct {
 // will contract. Boxes are laid out left to right, then top to bottom. Boxes
 // that go beyond the lengh of rows will be laid out according to columns, but
 // they will not expand vertically.
-func NewGrid (columns, rows []bool) *Grid {
-	this := &Grid {
+//
+// If you aren't sure how to use this constructor, here is an example:
+//
+//            X0     X1    X2     Y0    Y1    Y2
+//   NewGrid(true, false, true)(false, true, true)
+func NewGrid (columns ...bool) func (rows ...bool) *Grid {
+	return func (rows ...bool) *Grid {
+		return &Grid {
 			xExpand: columns,
 			yExpand: rows,
 		}
-	return this
+	}
 }
 
 func (this *Grid) MinimumSize (hints tomo.LayoutHints, boxes []tomo.Box) image.Point {

menuitem.go

@@ -27,7 +27,7 @@ func NewMenuItem (text string) *MenuItem {
 	}
 	box.SetRole(tomo.R("objects", "MenuItem", ""))
 	box.label.SetAlign(tomo.AlignStart, tomo.AlignMiddle)
-	box.SetLayout(layouts.NewGrid([]bool { false, true }, []bool { true }))
+	box.SetLayout(layouts.Row { false, true })
 	
 	box.Add(box.icon)
 	box.Add(box.label)

numberinput.go

@@ -32,7 +32,7 @@ func NewNumberInput (value float64) *NumberInput {
 	box.Add(box.input)
 	box.Add(box.decrement)
 	box.Add(box.increment)
-	box.SetLayout(layouts.NewGrid([]bool { true, false, false }, []bool { true }))
+	box.SetLayout(layouts.Row { true, false, false })
 	box.increment.SetIcon(tomo.IconValueIncrement)
 	box.decrement.SetIcon(tomo.IconValueDecrement)